Three-Rail Buck Controller for IMVP8

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Overview

The NCP81248 contains a two−phase, and two single−phase buckregulator controllers optimized for Intel IMVP8 compatible CPUs.The two−phase controller combines true differential voltagesensing, differential inductor DCR current sensing, input voltagefeed−forward, and adaptive voltage positioning to provide accuratelyregulated power for IMVP8 CPU.The two single−phase controllers make use of ON Semiconductor’spatented high performance RPM operation. RPM control maximizestransient response while allowing smooth transitions betweendiscontinuous frequency scaling operation and continuous mode fullpower operation. The single−phase rails have a low offset currentmonitor amplifier with programmable offset compensation for highaccuracy current monitoring.

  • Embedded Systems
  • Vin Range 4.5 V to 25 V
  • Startup into Pre−Charged Loads While Avoiding False OVP
  • Adjustable Vboot (except Rail 3)
  • High Impedance Differential Output Voltage Amplifiers
  • Dynamic Reference Injection
  • Programmable Output Voltage Slew Rates
  • Dynamic VID Feed−Forward
  • Differential Current Sense Amplifiers for Each Phase
  • Switching Frequency Range of 200 kHz – 1.2 MHz
  • Digitally Stabilized Switching Frequency

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NCP81248MNTXG

Active

Pb

A

H

P

QFN-48

1

260

REEL

2500

Y

Step-Down

1/2

Current/Voltage Mode

4.75

5.25

200 - 1200

$1.5111

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